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(4+x)x3=26+x
We move all terms to the left:
(4+x)x3-(26+x)=0
We add all the numbers together, and all the variables
(x+4)x3-(x+26)=0
We multiply parentheses
x^4+4x^3-(x+26)=0
We get rid of parentheses
x^4+4x^3-x-26=0
We do not support expression: x^4
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